VALUE ERROR IN LIST

Understand Value Error at list.

code:

def mylist_errors(tmp_lst):

# need to search for value 100 in the list.

val_search = 100

for x_lst in tmp_lst:

if x_lst is x_lst:

tmp_lst.remove(val_search)

else:

tmp_lst.append(val_search)

print(tmp_lst)

if __name__ == '__main__':

temp_list = [0, 200, 'apple', 900, 'orange']

mylist_errors(temp_list)

system out:

tmp_lst.remove(val_search)
ValueError: list.remove(x): x not in list

Errors on way while code:

From above code, list don't have val_search = 100 , so if you try to check the un-listed value from existing list, will throw following ValueError.

if x_lst is x_lst:

tmp_lst.remove(val_search)

How to Mitigate this situation:

Before performing operation on list, evaluate the variable/value is available in list.

Code:

def mylist_errors(tmp_lst):

# need to search for value 100 in the list.

val_search = 100

  if val_search in tmp_lst:
        print(True)
    else:
        print(False)

Next Method is to use Try Except block

try:

if val_search in tmp_lst:

print('working')

except ValueError:

print('Error')

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